General form of registration statement for all companies including face-amount certificate companies

Intangible Assets - Intangible Assets Recorded (Details)

v3.21.1
Intangible Assets - Intangible Assets Recorded (Details) - Blade Urban Air Mobility [Member] - USD ($)
$ in Thousands
 3 Months Ended 6 Months Ended 12 Months Ended
Mar. 31, 2021
Dec. 31, 2020
Mar. 31, 2021
Mar. 31, 2020
Sep. 30, 2020
Sep. 30, 2019
Finite-Lived Intangible Assets [Line Items]            
Gross Carrying Amount $ 1,451   $ 1,451   $ 948 $ 948
Accumulated Amortization (509)   (509)   (415) (225)
Net 942   942   533 723
Amortization of finite-lived intangible assets 47 $ 48 94 $ 94 $ 190 183
Domain name            
Finite-Lived Intangible Assets [Line Items]            
Gross Carrying Amount 503   503      
Net 503   $ 503      
Customer list            
Finite-Lived Intangible Assets [Line Items]            
Estimated useful life     5 years   5 years  
Gross Carrying Amount 942   $ 942   $ 942 942
Accumulated Amortization (507)   (507)   (414) (224)
Net 435   $ 435   $ 528 718
Trademarks            
Finite-Lived Intangible Assets [Line Items]            
Estimated useful life     10 years   10 years  
Gross Carrying Amount 6   $ 6   $ 6 6
Accumulated Amortization (2)   (2)   (1) (1)
Net $ 4   $ 4   $ 5 $ 5